Date: Sat, 27 Jan 2007 16:39:53 +0100 From: Roland Smith <rsmith@xs4all.nl> To: JoaoBR <joao@matik.com.br> Cc: freebsd-stable@freebsd.org Subject: Re: Loosing spam fight Message-ID: <20070127153953.GC96846@slackbox.xs4all.nl> In-Reply-To: <200701271304.29216.joao@matik.com.br> References: <8a20e5000701240903q35b89e14k1ab977df62411784@mail.gmail.com> <20070127141052.GA96039@slackbox.xs4all.nl> <45BB6296.1080106@pingle.org> <200701271304.29216.joao@matik.com.br>
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--V88s5gaDVPzZ0KCq Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sat, Jan 27, 2007 at 01:04:28PM -0200, JoaoBR wrote: > > Greylisting is a decent idea, but it seems to me that it's just another > > tool in the ongoing arms race against spammers. It may work for a while, > > but eventually they'll catch on and it will only cause unnecessary dela= ys > > for legitimate mail. > > >=20 > finally some cares about the users here, that is a really important > point, how do you justify that your client get the email he is waiting > for an hour later? Probably he looks then for a better service > provider ... The standard requires a retry time of at least 30 minutes: http://tools.ietf.org/html/rfc2821#section-4.5.3=20 But most open-source MTA's will try to resend after around 15 minutes: http://en.wikipedia.org/wiki/Greylisting=20 Note that the SMTP protocol does not guarantee delivery within a certain timeframe.=20 There are timeouts of several minutes for each of the SMTP commands. This means that a full SMTP conversation can last at least 1/2 hour, from one server to another. In short, an extra hour transit time is not a fault or bad service as far as SMTP is concerned. Roland --=20 R.F.Smith http://www.xs4all.nl/~rsmith/ [plain text _non-HTML_ PGP/GnuPG encrypted/signed email much appreciated] pgp: 1A2B 477F 9970 BA3C 2914 B7CE 1277 EFB0 C321 A725 (KeyID: C321A725) --V88s5gaDVPzZ0KCq Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.1 (FreeBSD) iD8DBQFFu3JJEnfvsMMhpyURAuj/AJ0R+CB0r+AXXndT/b1WwDwia/MWxACgr30s q9JgCt6ogvbmBvbAb7j3ltQ= =FE05 -----END PGP SIGNATURE----- --V88s5gaDVPzZ0KCq--
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